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Grotere/kleinere eenheden
fac­tor naam sym­bool
10−15 femtometer
of fermi
10−12 picometer pm
10−10 ångström Å
10−9 nanometer nm
10−6 micrometer
of micron
10−3 millimeter mm
10−2 centimeter cm
10−1 decimeter dm
1 meter m
101 decameter dam
102 hectometer hm
103 kilometer km
106 megameter Mm
109 gigameter Gm
1012 terameter Tm

Een femtometer is een lengtemaat uit het SI-stelsel. De maat heeft de afkorting fm. Een femtometer is gelijk aan 10−15 meter, ofwel 0,000 000 000 000 001 meter, ofwel 1 biljardste van 1 meter. Protonen en neutronen, de bouwstenen van de atoomkern, hebben een grootte van ongeveer 0,833 femtometer. Een fermi is gelijk aan een femtometer, maar is geen SI-eenheid.

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